Mortising-tool.



R. B. & J. N. GARNETT.

MORTISING TOOL.

APPLIOATION FILED SEPT. 18, 1911.

Patented July 2, 1912.

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,ifiomvfi WITNESSES.

COLUMB A PLANOORAPH COnWASHlNGTON, D. C

v UNITED STATES PATENT OFFICE.

REUBEN B. GARNETT AND JOHN 1\T. GARNETT, OF KANSAS CITY, MISSOURI.

MORTISING-TOOL.

Specification of Letters Patent.

Application filed September 18, 1911. Serial No. 649,865.

To all whom it may concern:

Be 1t known that we, REUBEN B. GAnNn'r'r and J orIN N. GARNETT, citizens of the United States, residing at Kansas City, in the county of Jackson and State of Missouri, have invented certain new and useful Improvements in Mortising-Tools; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters and figures of reference marked thereon, which form a part of this specification.

Our invention relates to a mortising tool and more particularly to a device of that character for use in cutting mortises in doors, window sash, or the like, for the reception of locks, pulley blocks, etc., the object of the invention being to provide a hand tool of this character which is simple and economical in construction and use.

In accomplishing this object, I have provided the improved details of structure hereinafter described and illustrated in the accompanying drawings, wherein Figure I is a perspective view of a mortising tool constructed according to my invention. Fig. II is a longitudinal, vertical section of same. Fig. III is a central horizontal section, illustrating the mounting of the saw sprocket wheels.

Referring more in detail to the parts 1 designates a clamp which may be applied to the edge of a door, window sash, or the like, and held rigidly in place by the screws 2. Clamp 1 is provided with a collar 3, through which the shank 4 of the saw frame is slidably projected and in which said shank may be fixed in an adjusted position by means of a set screw 5. On the shank 4 is a rail 6 having an upturned end block 7 provided with a threaded aperture 8. Slidably mounted on rail 6 is a head 9 having extended end members 10 for bearing on the top of the rail and having a laterally directed boss 11. On one side of the head 9 is a strut 12, the forward end of which has a slot 13 and carries a shaft 14 which extends through said slot.

Revolubly mounted in the head 9 and boss 1.1, is a shaft 15, one end of which projects laterally from the boss 11 and carries a crank 16; the other end of the shaft being extended laterally from the head and equipped with a sprocket wheel 17 Running over the sprocket 17 and a sprocket 18 on the forward shaft 141: is a chain saw 19, preferably comprising a tripple tier of links, or teeth, as shown. The ends of the shaft 14 projects laterally beyond the sides of the strut 12 and have rigidly fixed thereto the circular saws 21 which lie close to the sides of the struts, but are adapted for free revoluble movement with the shaft. At intervals throughout their peripheries the circular saws 21 have laterally bent teeth 22 for cutting a mortise of slightly greater width than the space between the edges of the circular saws, in order to provide space for free travel of the saw within the mortise. Threaded into the aperture 8 in the rear block 7 on the rail 6, is a screw 23, the inner end of which is adapted to bear against the rear end of said head, and the outer end of which has a handle 24 by which the screw may be turned to force the head inward.

In using the tool, presuming the parts to be assembled as described, the clamp 1 is attached to the edge of a door or sash, so that the strut 12 extends at a proper angle thereto, and the crank 16 is revolved to actuate the chain saw, through engagement of the sprocket teeth with the ends of the central links. \Vhen the crank and sprocket revolve, the chain is carried over and revolves the forward sprocket, which in turn revolves the shaft 14. and circular saws 21. lVhen the circular saws are revolved, they cut into the edge of the door or sash, marking a mortise in advance of the link teeth. As the crank is re\'olved the screw 23 is actuated to forward the head 10 and push the saw toward the door or sash, so that after the mortise is marked the middle portion thereof is cut out by the link teeth and the strut advanced until the mortise is cut to the desired depth.

It is apparent that a mortise of any desired length may be cut by moving the clamp along the door or sash and repeating the cutting operation just described.

Having thus described our invention, what we claim as new therein and desire to secure by Letters-Patent is A mortising tool comprising a clamp and head member, a rail having ashank on one end adjustably mounted in said clamp, and a block disposed on the opposite end, a head Patented July 2, 1912.

7 slidably mounted on said rail, a screw ar- In testimony whereof We aflix our signaranged in said block for engaging the head, tures in presence of tWo Witnesses. a strut secured to said head, a shaft revo- REUBEN B. GARNETT. lubly mounted in said head, a shaft disposed JOHN N. GARNETT.

" at one end of said strut, gears mounted on Witnesses: I said named shafts, and a chain-saw adapted MYRTLE M. JACKSON, for engagement With said gears. ARTHUR W. CAPS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

